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In Vitro Protective Effects of Plants Frequently Used Traditionally in Cancer

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In Vitro Protective Effects of Plants Frequently Used Traditionally in Cancer 1 In vitro protective effects of plants frequently used traditionally in cancer 2 prevention in Thai traditional medicine: an ethnopharmacological study 3 Natchagorn Lumlerdkija,b , Ranida Boonraka, Suksalin Booranasubkajorna, Pravit 4 Akarasereenonta,c, Michael Heinrichb* 5 a Center of Applied Thai Traditional Medicine, Faculty of Medicine Siriraj Hospital, Mahidol 6 University, 2 Wanglang Road, Bangkoknoi, Bangkok 10700, Thailand 7 b Research Group Pharmacognosy and Phytotherapy, UCL School of Pharmacy, 29-39 8 Brunswick Square, London WC1N 1AX, UK 9 c Department of Pharmacology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 10 Wanglang Road, Bangkoknoi, Bangkok 10700, Thailand 11 *Corresponding author. 12 E-mail address: [email protected] (N. Lumlerdkij), [email protected] (R. 13 Boonrak), [email protected] (S. Booranasubkajorn), [email protected] (P. 14 Akarasereenont), [email protected] (M. Heinrich) 15 Abstract 16 Ethnopharmacological relevance: Thai traditional medicine (TTM) has been used widely in 17 cancer management in Thailand. Although several Thai medicinal plants were screened for 18 pharmacological activities related to cancer treatment, such evidence still suffers from the lack 19 of linking with TTM knowledge. 20 Aim of the study: To document knowledge and species used in cancer prevention in TTM and 21 to preliminary investigate pharmacological activities related to the documented knowledge of 22 twenty-six herbal drugs used in cancer/mareng prevention. 23 Methods: Fieldwork gathering data on TTM concept and herbal medicines used in cancer 24 prevention was performed with TTM practitioners across Thailand. Later, water and ethanol 25 extracts from twenty-six herbal drugs mentioned as being used in cancer prevention were 26 screened for their protective effect against tert-butyl hydroperoxide-induced cell death in 27 HepG2 cells. Then active extracts were investigated for their effects on NQO1 activity, 28 glutathione level, and safety in normal rat hepatocytes. 29 Results: The fieldwork helped in the development of TTM cancer prevention strategy and 30 possible experimental models to test the pharmacological activities of selected medicinal 31 plants. Fifteen plant extracts showed significant protective effect by restoring the cell viability 32 to 40 - 59.3%, which were comparable or better than the positive control EGCG. Among them, 33 ethanol extracts from S.rugata and T.laurifolia showed the most promising chemopreventive 34 properties by significantly increased NQO1 activity, restored GSH level from oxidative 35 damage, as well as showed non-toxic effect in normal rat hepatocytes. 36 Conclusion: TTM knowledge in cancer prevention was documented and used in the planning 37 of pharmacological experiment to study herbal medicines, especially in cancer, inflammation, 38 and other chronic diseases. The proposed strategy should be applied to in vivo and clinical 39 studies in order to further confirm the validity of such a strategy. Other traditional medical 40 systems that use integrated approaches could also apply our strategy to develop evidence that 41 supports a more rational uses in traditional medicine. 42 Keywords: cancer prevention, traditional medicine, Senegalia rugata, Thunbergia laurifolia 43 44 1. Introduction 45 Cancer patients worldwide have increased their interests in using complementary or alternative 46 medicines for cancer care. It was reported that 9 - 81% of cancer patients mentioned the uses 47 of at least one type of complementary or alternative therapy, especially herbal medicines, after 48 their cancer diagnosis (Damery et al., 2011). In Thailand, Thai traditional medicine (TTM) is 49 an essential form of integrative medicine used by cancer patients. Generally, it is considered to 50 be beneficial, especially in pain relief. However, the use of TTM in cancer patients lacks a 51 systematic development of an evidence-based approach (Poonthananiwatkul et al., 2015). 52 Although cytotoxicity of Thai medicinal plants were reported (Itharat et al., 2004; Lee and 53 Houghton, 2005; Mahavorasirikul et al., 2010; Saetung et al., 2005), other pharmacological 54 activities related to cancer treatment and prevention in TTM are still needed for developing a 55 more rational use. 56 TTM is considered a holistic medical system focusing on maintaining the balance of the body, 57 especially of the four fundamental elements (dhātu si) which are dhātu din (earth), dhātu nam 58 (water), dhātu lom (wind), and dhātu fai (fire). When a person loses this balance, he/she will 59 become ill (Chokevivat and Chuthaputti, 2005). Maintaining the balance of the elements is the 60 main strategy for preventing illnesses. 61 In modern Thai, mareng is commonly used to refer to cancer. In TTM scriptures, it is also used 62 to refer to other diseases, which mostly are severe skin conditions (Foundation for the 63 Promotion of Thai Traditional Medicine and Ayurved Thamrong School Center of Applied 64 Thai Traditional Medicine, 2007). Therefore, mareng is not equal to cancer. We previously 65 studied the Thai concept of mareng and proposed for the first time five characteristics of cancer 66 in TTM and compared them to Western medical concepts. In the same report, we also proposed 67 that a TTM condition called krasai could involve oxidative stress (Lumlerdkij et al., 2018). 68 Oxidative stress has an important role in carcinogenesis. Elevated reactive oxygen species 69 (ROS) levels can initiate DNA damage, help cancer cells to acquire proliferative signals and 70 resist apoptosis, and promote the invasion, metastasis and angiogenesis (Fiaschi and Chiarugi, 71 2012). Therefore, oxidative stress can be an important target in cancer prevention in both 72 biomedical and TTM senses. 73 Antioxidant systems are important in the prevention from toxic substances and carcinogens. 74 NAD(P)H:quinone oxidoreductase 1 (NQO1) is involved in the defence against toxicity and 75 carcinogenicity of quinones (Ross et al., 2000). Glutathione plays a crucial role in the 76 detoxification of toxic or carcinogenic reactive metabolites. It also protects against superoxide 77 and hydrogen peroxide formed during the metabolism (DeLeve and Kaplowitz, 1991; Melino 78 et al., 2011). Therefore, we proposed that NQO1 and glutathione were possible 79 pharmacological mechanisms to remove waste from the body in TTM sense (Lumlerdkij et al., 80 2018). 81 The objectives of this study are to document knowledge and species used in cancer prevention 82 in TTM and to assess pharmacological activities related to the documented knowledge; 83 including cytotoxicity, protective effect against oxidative stress, and effects on glutathione and 84 NQO1 enzyme activities of twenty-six species used in cancer/mareng prevention. 85 2. Materials and methods 86 2.1. Materials 87 AlamarBlue and PrestoBlue were bought from Abd Serotec. Primary rat hepatocytes from 88 Sprague-Dawley rats (RTCP10, Lot number RS874), Dulbecco's Modified Eagle Medium 89 (DMEM), Foetal Bovine Serum (FBS), PBS, Penicillin-Streptomycin (10,000 U/mL), 90 Williams E Medium, dexamethasone, human recombinant insulin, GlutaMAXTM, and HEPES 91 were purchased from Life technologies. HepG2 cells (ACC No 85011430, Lot 11C013), (-)- 92 Epigallocatechin gallate (EGCG) (E4268), paclitaxel (T1912), Albumin from bovine serum 93 (A2058), β-Nicotinamide adenine dinucleotide 2′-phosphate reduced tetrasodium salt hydrate 94 (NADPH) (N1630), L-Glutathione reduced (G4251), 5-5'-dithiobis (2-nitrobenzoic acid) 95 (DTNB) (D218200), thiazolyl blue tetrazolium bromide (MTT) (M5655), glutathione 96 reductase from baker's yeast (S. cerevisiae) (G3664), 5-Sulfosalicylic acid (SSA) (S2130), 97 DMSO, Complete Mini protease inhibitor cocktail (11836170001), and other reagents were 98 from Sigma Aldrich. NADP monosodium salt (sc-202724) and dicoumarol (sc-205647A) were 99 purchased from Santa Cruz Biotechnology. Glucose 6-phosphate disodium salt was from Bio 100 Basic Canada Inc. Yeast glucose 6-phosphate dehydrogenase (J61181) and flavin adenine 101 dinucleotide disodium salt (FAD) (A14495) were from Alfa Aesar. RIPA lysis buffer 10X was 102 from Merck Millipore. DC Protein Assay kit (500-0116) was from Bio-Rad Laboratories, Inc. 103 2.2. Ethnopharmacological field survey 104 Interviews with 33 TTM practitioners were carried out during December 2013 – April 2014 in 105 different regions of Thailand. The core questions used were ‘can mareng be prevented?’ or 106 ‘how can we prevent mareng?’ The project was approved by the UCL Research Ethics 107 Committee, Project ID: 5068/001, and Siriraj Institutional Review Board (Thailand), Protocol 108 number 779/2556(EC4). Information on the interviews and further details on data collection 109 are given in (Lumlerdkij et al., 2018). It followed the guidelines for such research (Heinrich et 110 al., 2018). 111 Identification of voucher specimens was done by comparison with books, monographs, or 112 authentic specimens from botanical gardens with helps from experienced TTM practitioners 113 from Center of Applied Thai Traditional Medicine, Faculty of Medicine Siriraj Hospital, 114 Mahidol University, Thailand (CATTM). Imported crude drugs were identified by comparing 115 macroscopic features with authentic materials obtained from Sun Ten Pharmaceutical Co., 116 Ltd.. Some common food plants, such as ginger, garlic, shallot, and mung bean were not 117 collected. Plant voucher specimens were deposited at Faculty of Pharmacy, Mahidol 118
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